First of all, I wan't to mention that I have just really gotten into learning about this stuff now, so pardon my lack of knowledge.
With that being said... I was looking to purchase the Völkl Revolt 85 with either Marker Squire or Grifon bindings from Glisshop. (https://www.glisshop.co.uk/pack_ski/volkl/revolt_85_griffon_13_id_90mm_black-117787-117743-89849.html). Mounting of the bindings is included in the price, but then you of course have to fill out some info about your weight, height etc. You also have to fill out the sole length of your ski boots. The problem is that i do not currently own a pair of ski boots. I do however know that my size is around 28.
So basically I'm wondering, if I put my sole length at say 320 or so, would the difference between me getting either a 27.5, 28 or a 28.5 ski boot (so roughly 315-330 mm sole length), be too big to adjust the bindings accordingly myself (or get it done somewhere) afterwards.
Sorry if I'm not being very clear, and please do tell me if I'm being stupid.